How to get list of objects from session in javascript ASP.NET?

Question

I have created checkboxes dynamically from list of checkboxes and i saved this list into a session and want to get this List of checkboxes from session in checkbox's onChange event. Here is the code.

    public static List <CheckBox> chklist = new List <CheckBox> ();
    void arrinit() {
        for (int i = 0; i < 31; i++) {
            //initializing list of checkboxes
            chklist.Add(new CheckBox());
        }
    }
    void show() {
        for (int i = 0; i < 30; i++) {
            TableCell cell4 = new TableCell();
            tRow.Cells.Add(cell4);
            ((IParserAccessor) cell4).AddParsedSubObject(chklist[i]);
            chklist[i].ID = "cbx_" + i.ToString();
            string a = "processChechBox('" + "ctl00_ContentPlaceHolder1_" + chklist[i].ID + "'); return false;";
            chklist[i].Attributes.Add("onChange", a);
            chklist[i].Attributes.Add("runat", "server");
        }
        Session["chk"] = chklist;
    }

    function processChechBox(id) {
        //here is the javascript function for checkbox onChange event
        debugger;
        var containerRef = document.getElementById(id);
        var data = document.getElementById(id);
        data.value = '1';
        data.checked = true;
        var a = '<%= Session["chk"]%>';
    }

var a = '<%= Session["chk"]%>'; this line is returning System.Collections.Generic.List1[System.CheckBox] instead of list processChechBox(id) this function is called on every check box checked.

Community · Accepted Answer · 2017-05-23 11:51:47Z

0

This line

<%= Session["chk"]%>

Will write out the equivalent of

Session["chk"].ToString()

which obviously is not what you want here. What do what to accomplish with the 'var a' used here?

My guess is you really want something like this

<% var serializer = new System.Web.Script.Serialization.JavaScriptSerializer(); %>
var jsVariable = <%= serializer.Serialize(((List<CheckBox>)Session["chk"]).ToArray()) %>;

Credit to: Pass C# ASP.NET array to Javascript array

edited May 23, 2017 at 11:51

CommunityBot

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answered Sep 20, 2016 at 13:20

Paul Swetz

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2 Comments

muhammad Over a year ago

I copied and paste your code and its giving me exception: {"Exception has been thrown by the target of an invocation."} and the inner exception is: {"This operation requires IIS integrated pipeline mode."}

Paul Swetz Over a year ago

If you change the app pool to use integrated that should go away, not sure why its required.

Hemant D · Accepted Answer · 2016-09-20 13:27:41Z

0

Try with below approach and check what you got in console log.

function processChechBox(id) {
//here is the javascript function for checkbox onChange event
debugger;

var containerRef = document.getElementById(id);
var data = document.getElementById(id);
data.value = '1';
data.checked = true;

var list = <%= new JavaScriptSerializer().Serialize(Session["chk"]) %>;
console.log(list);

}

answered Sep 20, 2016 at 13:27

Hemant D

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